Tokina 12-24 or 16-50

I'm really confused about choosing one of them.
I know their classes and purposes are completely different but I'm not sure which one fits me. I'm planning to take portraits, landscapes and other different scenes. Actually what I'm looking for is a all around lens, so you may say then forget about 12-24, however I'm concerned whether or not 16mm is enough for landscape photos.
In that case, what is your ideas and suggestions.

What lenses do you have now? 24mm is too short for most portraits. If this is going to be your only lens, the choice should be obvious.

I have 50mm 1.8 and it's the only one I have.
Only thing makes me think is the difference between 12mm and 16mm. Not sure whether it restricts me as shooting landscapes.

No one lens is ever going to be without restrictions. Why not get a Canon 18-55 IS lens? Good lens for someone in your situation = beginning.

lzooml wrote in post #11236339
I have 50mm 1.8 and it's the only one I have.
Only thing makes me think is the difference between 12mm and 16mm. Not sure whether it restricts me as shooting landscapes.

I have a Tokina 11-16mm, and I find that I am at the 16mm end more than I am at the 11mm end for landscapes.

tokina all the way